Few days back after a long session of browsing internet ( I had no work that day and was bored to max level) there was slight pain in my finger. I realized that it was due to lots of scrolling of mouse wheel. This led to an idea in my mind that what if we harness the energy used in turning the mouse scroll wheel and charge the battery inside the mouse? This will give us a wireless mouse that will never need a battery change!
To make this happen nothing new has to be developed, and changes can be made to any existing wireless mouse. What I have thought is developing a mouse wheel which has wire winding inside it (as illustrated in above picture) and attach two powerful magnets at both sides of wheel. Now as the wheel rotate, the winding will generate electricity which can be transferred thru slip rings like structure. This is very commonly seen technology in car alternator which also generates electricity when rotated at high speed from engine. But problem is we do not turn mouse wheel so fast, this means voltage will be less. The voltage can be pumped up by voltage booster circuit and then used to charge a li-po/ion battery.
As a backup the mouse can have micro USB port to connect to computer USB for charging the battery in case the mouse was not used for long. So for short time the mouse will look like wired but soon it can be detached and used as a wireless mouse as more it will be used, more the battery will be charged.
PS: If you are a mouse manufacturer thinking of making this mouse commercially, don’t forget to pay me royalty!